Got a lot of flying to do in September? If so, JetBlue has the deal for you.

Book an All-You-Can-Jet Pass and you can fly anywhere that JetBlue goes, as many times as you want from September 8 to October 8, for one low price. Saint Lucia one week, Seattle the next, all for just $599 (plus taxes for international destinations and Puerto Rico – domestic taxes are covered). Depending on which of JetBlue’s 56 domestic and international destinations your travels will take you to, the Pass could easily earn its price in two or three trips.

But, as ABC News points out, you should compare the cost of buying each trip a la carte versus going with the Pass; if you’ll be flying the cheaper routes, you’d have to fly a whole lot to make the Pass a good deal. Do the math before you commit.

Flights must be booked three days in advance and you may only book one flight per day. There are no blackout dates. If you’ve already bought tickets to fly on JetBlue during the month, you can pay the difference to upgrade to the Pass.

Passes will be on sale through Friday, August 21st “while supplies last”. There’s no word on how many Passes are available, so act fast or you might miss out.